下午好。我在我的应用程序中使用旋转木马。目前我无法使进度视图每个项目轮播。问题是当我单击"下载按钮"进度视图时，首先添加了一个项目。他看起来很好并且有效，但也出现在另一个视图中的另一个 2 个项目中，它不应该是。之后，当我再次单击" 下载按钮 " 进度视图开始相互混淆。请确切地告诉我我做错了什么以及我是如何的？我是objective-c的新手。
P.S 要下载数据，我使用 AFNetworking。
旋转木马：
- (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index reusingView:(UIView *)view
{
NSString *docDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
NSDictionary *myDic =[magazinesInfo objectAtIndex:index];
//Change image size
UIImage *img = [UIImage imageWithImage:[UIImage imageWithContentsOfFile:[NSString stringWithFormat:@"%@/%@_img.png",docDir,[myDic objectForKey:@"title"]]] scaledToSize:CGSizeMake(370,513)];
UIImageView *faceImage = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,768,1004)];
UIImage *dwImage = [UIImage imageNamed:@"button.png"];
UIImage *readImage = [UIImage imageNamed:@"read_button.png"];
UIImage *deleteImage = [UIImage imageNamed:@"delete_button.png"];
UIImage *cancelImage = [UIImage imageNamed:@"cancelButton.png"];
if(view ==nil)
{
UILabel *nomer = [[UILabel alloc] initWithFrame:CGRectMake(345, 85+MY_OFFSET, 75, 29)];
UILabel *nameMag = [[UILabel alloc] initWithFrame:CGRectMake(55, 720+MY_OFFSET, 658, 80)];
UILabel *dateMag = [[UILabel alloc] initWithFrame:CGRectMake(55, 821+MY_OFFSET, 658, 23)];
UIButton *downloadButton = [[UIButton alloc] initWithFrame:CGRectMake(321, 890+MY_OFFSET, 128, 37)];
UIButton *readButton = [[UIButton alloc] initWithFrame:CGRectMake(246, 890+MY_OFFSET, 128, 37)];
UIButton *deleteButton = [[UIButton alloc] initWithFrame:CGRectMake(385, 890+MY_OFFSET, 128, 37)];
UIButton *cancelButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0+MY_OFFSET, 128, 37)];
view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 768, 1004)];
view = faceImage;
faceImage.image = nil;
((UIImageView *)view).image = nil;
view.contentMode = UIViewContentModeCenter;
//Magazine number
nomer.backgroundColor = [UIColor clearColor];
nomer.textAlignment = NSTextAlignmentCenter;
[nomer setFont:[UIFont fontWithName:@"OpenSans-Light" size:36.0f]];
nomer.textColor = [UIColor whiteColor];
nomer.tag = 1;
//Magazine name
nameMag.backgroundColor = [UIColor clearColor];
nameMag.textAlignment = NSTextAlignmentCenter;
[nameMag setFont:[UIFont fontWithName:@"OpenSans-Light" size:30.0f]];
nameMag.numberOfLines=2 ;
nameMag.textColor = [UIColor blackColor];
nameMag.tag = 3;
//Date magazine
dateMag.backgroundColor = [UIColor clearColor];
dateMag.textAlignment = NSTextAlignmentCenter;
[dateMag setFont:[UIFont fontWithName:@"OpenSans-Light" size:20.0f]];
dateMag.textColor = [UIColor blackColor];
dateMag.tag = 4;
//Download button
[downloadButton setBackgroundImage:dwImage forState:UIControlStateNormal];
[downloadButton addTarget:self action:@selector(pressDownload:) forControlEvents:UIControlEventTouchUpInside];
downloadButton.tag = 5;
downloadButton.hidden = YES;
//Read button
[readButton setBackgroundImage:readImage forState:UIControlStateNormal];
[readButton addTarget:self action:@selector(readMag:) forControlEvents:UIControlEventTouchUpInside];
readButton.hidden=YES;
readButton.tag = 8;
//Delete button
[deleteButton setBackgroundImage:deleteImage forState:UIControlStateNormal];
[deleteButton addTarget:self action:@selector(deleteMag:) forControlEvents:UIControlEventTouchUpInside];
deleteButton.hidden=YES;
deleteButton.tag = 9;
[cancelButton setBackgroundImage:cancelImage forState:UIControlStateNormal];
[cancelButton addTarget:self action:@selector(deleteMag:) forControlEvents:UIControlEventTouchUpInside];
cancelButton.hidden=NO;
cancelButton.tag = 10;
//Add label to view
[view addSubview:nomer];
[view addSubview:nameMag];
[view addSubview:dateMag];
//Add button to view
[view addSubview:downloadButton];
[view addSubview:readButton];
[view addSubview:deleteButton];
[view addSubview:cancelButton];
}
else
{
//Set tag to image
((UIImageView *)faceImage).image = (UIImage*)[view viewWithTag:2];
//Set tag to label
[[[view subviews]objectAtIndex:0]viewWithTag:1];
[[[view subviews]objectAtIndex:1]viewWithTag:3];
[[[view subviews]objectAtIndex:2]viewWithTag:4];
//Set tag to button
[[[view subviews]objectAtIndex:3]viewWithTag:5];
[[[view subviews]objectAtIndex:4]viewWithTag:8];
[[[view subviews]objectAtIndex:5]viewWithTag:9];
[[[view subviews]objectAtIndex:6]viewWithTag:10];
}
//Hide button download and show read,delete button
NSFileManager *fileManager = [NSFileManager defaultManager];
if ([fileManager fileExistsAtPath:[NSString stringWithFormat:@"%@/%@_mag.pdf",docDir,[myDic objectForKey:@"title"]]] == YES)
{
[[[view subviews] objectAtIndex:4] setHidden:NO];
[[[view subviews] objectAtIndex:5] setHidden:NO];
[[[view subviews] objectAtIndex:3] setHidden:YES];
}
else
{
[[[view subviews] objectAtIndex:4] setHidden:YES];
[[[view subviews] objectAtIndex:5] setHidden:YES];
[[[view subviews] objectAtIndex:3] setHidden:NO];
}
//Hide date and name of magazine when view changed
if (index != [self.carousel currentItemIndex]) {
[[[view subviews]objectAtIndex:1]setHidden:YES];
[[[view subviews]objectAtIndex:2]setHidden:YES];
}
else{
[[[view subviews]objectAtIndex:1]setHidden:NO];
[[[view subviews]objectAtIndex:2]setHidden:NO];
}
((UIImageView *)view).image = img;
UILabel *nomer = [[view subviews]objectAtIndex:0];
nomer.text = [myDic objectForKey:@"title"];
UILabel *nameMag = [[view subviews]objectAtIndex:1];
nameMag.text = @"Жить интересно!” №5 Путешествия как стиль жизни";
UILabel *dateMag = [[view subviews]objectAtIndex:2];
dateMag.text = [myDic objectForKey:@"date"];
return view;
}
下载按钮操作：
- (IBAction)pressDownload:(id)sender
{
NSLog(@"download button was pressed");
NSFileManager *fileManager = [NSFileManager defaultManager];
NSDictionary *myDic = [magazinesInfo objectAtIndex:curID];
NSString *docDir = [NSHomeDirectory() stringByAppendingPathComponent:@"Library/Caches"];
NSString *pdfFilePath = [NSString stringWithFormat:@"%@/%@_mag.pdf.tmp",docDir,[myDic objectForKey:@"title"]];
NSString *newPdfNamePath = [NSString stringWithFormat:@"%@/%@_mag.pdf",docDir,[myDic objectForKey:@"title"]];
//Test for Progress bar
UIButton *pressedButton = (UIButton *)sender;
UIView *superViewOfPressedButton = pressedButton.superview;
UIProgressView *downloadProgress = [[UIProgressView alloc] initWithFrame:CGRectMake(300, 950, 127, 8)];
UILabel *downloadPrecent = [[UILabel alloc]initWithFrame:CGRectMake(430, 950, 60, 20)];
[superViewOfPressedButton addSubview:downloadProgress];
[superViewOfPressedButton addSubview:downloadPrecent];
[downloadProgress setHidden:NO];
[downloadPrecent setHidden:NO];
NSLog(@"%@",sender);
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[myDic objectForKey:@"magazine"]]];
AFURLConnectionOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:pdfFilePath append:NO];
[operation setDownloadProgressBlock:^(NSUInteger bytesRead, long long totalBytesRead, long long totalBytesExpectedToRead)
{
downloadProgress.progress = (float)totalBytesRead / totalBytesExpectedToRead;
downloadPrecent.text =[NSString stringWithFormat:@"%1.0f%@ ",((float)totalBytesRead / totalBytesExpectedToRead)*100,@"%"];
}];
[operation setCompletionBlock:^{
[fileManager moveItemAtPath:pdfFilePath toPath:newPdfNamePath error:NULL];
[fileManager removeItemAtPath:[NSString stringWithFormat:@"%@/%@_mag.pdf.tmp",docDir,[myDic objectForKey:@"title"]] error:NULL];
[downloadProgress setHidden:YES];
[downloadPrecent setHidden:YES];
NSLog(@"downloadComplete!");
[carousel reloadData];
}];
[operation start];
}
致韦恩：对不起，但我无法理解你的问题。我以下载数据的方法传递字典中的URL。在方法旋转木马中，我分配进度视图标签= 7，然后添加条件隐藏，如下所示：
if (([fileManager fileExistsAtPath:[NSString stringWithFormat:@"%@/%@_mag.pdf.tmp",docDir,[myDic objectForKey:@"title"]]] == YES) && (index == [self.carousel currentItemIndex]))
{
[[[view viewWithTag:7] setHidden:NO];
[[[view viewWithTag:7] setHidden:NO];
}
else
{
[[[view viewWithTag:7] setHidden:YES];
[[[view viewWithTag:7] setHidden:YES];
}
不要在 pressDownload: 中创建和添加进度视图。相反，请在创建视图时创建它，但将其设置为 hidden 。然后，当您需要它时，只需取消隐藏它。重用视图时，请确保根据是否在该索引处下载项目来设置适当的值。